Transmission gearing



Nov. 3, 1931. v s 1,830,252

TRANSMI SSION GEARING Filed Sept. 11. 1929 rar NrfoFFICE rams nvnnnsorionnmnng CALIFORN A f f TRANSMISSION "GEABING 'Theginventionforming the subjectmatter t, of this;application-relates to:transmission gearing," and more specifically to heavy-type of toothedtransmission gearingthatxisjpar- -16 ticularlyt adapted fori use' inconnection with heavy machinery. -Y I Q t r j An object of theinventioniis; to provide a toothed transmission gearingwherein thefrictional resistance of :the lineshed, gears is reduced to a minimum,and wherein the enlarly strong and positive," 7 I Another object oftheinvention 1s to pro- .vide a transmission gearing of the character setforth that will -ber'superior, in point of simplicity, inexpensivenessof construction,

, ositiveness of operation',and facilit f convenience in use and generaleficlency i .7 With the foregoing and othe objects lowing, detaileddescription and specifically pointedout in theappended:claims,?reference is had to. the accompanying drawings for"the. illustrative embodiment ofthe invention, whereinz i *3 t;

' Fig; 1v is a side elevation of-th'e'transmis sion-gearing forming theinvention; e,

-Fi'g. v is a plan-view; of the'transmission gearingas showninFigl; I 7v Fig, is a detailed sectional v-iew' taken onthe-line 3+.8zofFig. 1 andshown on an enlarg'eclscale. I Referring to I the? I accompanying vdrawings wherein i similar: reference characters designate similar partsor throughout, the various figures described above adequately illustrate*myinvention, and the following detailed de scriptionis commensurate.withthe t above parts-Ofthesameyx I v r i v :The deviceinvolvesvinsitsigeneraliorgans i ization atransmission'gearingdesignated as an entirety by the reference numeral 5 andcomprises a driveishaft 6' and a driven shaft "7. Mounted on the driveshaft 6 is a' relativelysmalldriviiiggear 8 having teeth 9, which gearmay be secured against rotation on said shaft by means of a key 11. Thedriven shaft 7 has mounted thereon a relagagement of the gears isrendered particll transmissions.

View, which will be'mademanifest in the fol-f 7 mentioned drawingsin;enabling; an. artisan I to constructwand :assemble the constituentApplication filed September 11," 19 29. Serial No. 391,822.

tively large drivengear 12 provided with V teeth 13, which teeth meshwith the teethx9 of thedriving gear 8 in the customaryman ner. l Saidgear 12-may also be secured against rotation on the driven shaft Thymeans of a 6 5 key 14. From the vforegoing it will be seen that thedriving gear 8 meshing with the driven gear 12 provides the usual typeof gear transmission means wherein a small gear denoted by thev drivinggear 6' is adapted to drive a large gear denoted by the driven gear 12.This construction, as has been stated, is of the usual type and providesnothing that differs from the common I use of gear g It has been found,however, that great strainis placed onltheteeth 9 of the small drivinggear 8in'driving a large gearsuch as the gear '12, and. more especiallywhen the load on the gear 12 is heavy. This constantv st rain occasionsexcessive wear on the teeth- 9 'an d'l3 of the gears 6 and 12, therebycausing a; loss in the eficiency of said gears, and also causing thegears to wear out prematurely, necessitating'constant replacement.Therefore; it V is proposed to provide means for strengthening 'theengagement between the gears and'13 and also for reducing, 1n a largedegree,the friction setup by theengaging gears. Said means comprises apair of supplemental gears 16 and 17 mountedonthe drivingshaft 6 andpositionedadjacent the opposite faces of the driving gear 8. The gears16and 17 may be secured to the opposite faces of the gearby means ofscrews so as to rotate therewith, or be secured against rotation on theshaft 6 by the key 11.;

a Eaclrof the gears 16 and 17 is formed with aplurality of; radiallyextending fingers roller bearings'extending from the opposite sides ofthe gear are disposed in axial alignment forming. individual sets. Eachset of roller bearings 19 is rotatably mounted on acommon pin or stubshaft '21 which ex tends through said bearings and through an 1 openingformed in the gear 12. At the outer ends thereof'the pins 21'-arefsupportcd by ,means of" semi circular. hollow cup-shaiped 1 ings,each of'the 'pins 2lfarciormed with: i a head 23 at oneend fwhich' whenthe pin 7 extended" through. an opening in" oneof the" brackets22-abutsl against the" wall of said I brackets 22, the straight edgesofwhich-face outwardly and are.open.- The brackets 22cm I tend outwardlyfrom the opposite sidesof'the" gear'12 and form an integral part thereofin their preferred construction, as is clearly illustrated in Fig.3.Inor-der. that'eachaseti'i ofbearings 19 may rendered readily re.-inovahle, as forreplacem'ent' of worn bears bracket. At the otherendthereof eachpin 21*is" provided with; a threaded reduced end 24 whichextends through a re'duce'diop'ening in the opposed'hracket 252i Eachpin is'selcured in positionby means- 0f a nut Q'dWlhichthre'adedlyengages the threaded endQ i of the saidflpin'. i g b Inop'eratiom theconcave'faces of the -fin gers- 18" of the gears 16 and 17 engage therollers 19 extending from the opposite faccs Crate gear 12 'inthe'mannershown in 1,

and the-teeth 9 ofth'e gear8 engage the teeth V 13 of the gearrlQ. Nowwhen the-driring shaft'Gis rotate'd'the motion'will be transmitted tothedrivenshait 7"causingtlie same-to turn, with a minimumoi frictionalresistance due t'o the fact that the rollers 19? will rotate Ver theconcave surfaces 0f the fingers-18 7 twill e seen that inithe presentconstrue tion the gears 8 and 12 may have. fewente'eth than isrequiredlinthe usual gears; and at the same time providea geartransmission that isequally asstrong; dueto'tlie factftharthe fingers 18'oii the gears 16and17 engagin'g the "rollers 19101 the gear'1'2"1supplement" for the gear teeth dispensed with andwiththe addedfeature of reducing toa' marked" degree the element of friction. It is awell known fact that the fri'ction between two meshed gearsof the usualconstruction is exception ally large due to the-fact that there is atleast three points of contact between the teeth in thenieshed gears Forthis reason it is-pref eralolejthatthe spacing of the teeth; in thegears 8 ,and 12 of the present construction be 7 such that there w-illheonly one point of'c'om tact between-the teeth of the said gears: It

isalso desired that the relative 'spacingoof the roller 1bearings=19 ofthe gear 12 and {the fingers 1810f the-gears 16 and 17 109 such that twofingers of each of the gears 'ld and 17 be in constant contact withtwo'of the roller-s19;

.. making four points of contact between the sa d members, asis; clearlyshown in Fig. I.

Although there is probably a larger nuni ber of points of contact in thepresent construction over the usual gear construction,

it will benoted that the friction is less, due

.to the fact that four of the points of contact are'roller bearingcontacts, which, of course,

provide: a minimum of. frictional resistance 1 as compared tothat ofmeshed teeth.

I From the foregoing, it is thought that the construction, use and manyadvantages of the herein"describedlgear transmission will bereadilyunderstood without furtherde- 1 scription, and it will also beunderstood that changes 1in the formpproportion and minor details ofconstruction may be resorted to withoutdepar-ting from: the spiritojfithe invention=,-: o'r 'sacrificingany: of the advantagesthereof. 7 rI "Wli'at lclaim'is": s 7 '1; Transmissiongearing comprising-.agear andpinion in intermeshingrelation saidigear having plurality 0'5 equisingularly spaced pins transversely'fixed in -the rinrthereof andextending: from both sidesasleeves rotatably mounted-on said pins,retaining members for said sleeyes-,-sa id pinion: being interposedlb'e-j tween a pa1r oi toothed: members adapted to cooperatewith-said-sleeves. I I V 2.". lf8:I1Sll'llSSlOnag(-32Il11gQOlIlpI'lSlIlg a gear and pnnoin 1n.interme'shing relation, a: plu- .rality of: pins fixed in: the rimthereof and:

extending outwardly from both sides, said pins bein'gz equiz-angularlyspaced; sleeves ro-' tatablyqnounted onsaidi pins, housing menr hersspanning: said -p ins: and adapted to" retam -saidasleeves and: supportthe' outer ends of. said. pins, toothed: members i'n' fixed'relasleeves. 1. f

4. transmission. gear haying cast" integralz withthe rim thereofiaipiurality'of equiangularlyj spaced semi-circularhousings equi; distantfrom the and parallel there;

with, pins detachably securediandiextending throughsaid ihousingsrand-said rim' andirollens-1 mounted onsaid pin swithin I said lionsings.

v i In testimony whereofl haye'afiixed my signature. I

"PE ER

